Get average with nested relationship belongs to in laravel - php

Question

I want to ask for you. hopefully my problem will be quickly resolved.
I have 3 tables consist of :
ads
id
title_ads
transaction
id
transaction_id
id_ads
rating
id
transaction_id
rating_value
relationship :
ads to transaction is has many
transaction to rating is belongs to
I want to ask this, how to get avg rating value from table ads? I am confused, because I think to get avg rating maybe use hasManyThrought but in this case, There is relationship belongsTo. hwo to solved it? Thank you very much :)

Answer 1

Define a hasManyThrough relation in your Ad model
class Ad extends Model
{
/**
* Get all ratings of an Ad.
*/
public function ratings()
{
return $this->hasManyThrough('App\Rating', 'App\Transaction');
}
}
Now you can get the ratings in your controller with the Ad model and the ratings relation
public function getRatingsAverage()
{
// Fetch a single ad (or remove the find and get multiple)
$ad = Ad::where('id', 1)->with('ratings')->get();
// write average logic here...
// could be something like this:
$total_rating = 0;
foreach($ad->ratings as $rating) {
// loop through all the ratings of the ad and add the value to the total rating
$total_rating = $total_rating + $rating->value;
}
// divide the total rating by the amount of ratings to get the average
$average = $total_rating / count($ad->ratings);
}

Answer 2

To get to your ratings for each ad you can query the ads by eager loading the relationships. Then you can access the transactions and the ratings by looping through the $ads and add you average logic.
$ads = Ads::with('transaction.rating')->get();
//Load all ads with the transaction and rating relations
foreach($ads as $ad){
//All transactions from the ad
$transactions = $ad->transaction;
foreach($transactions as $transaction){
//The rating from the transaction
$rating = $transaction->rating;
}
}